[llvm-dev] Location (in Source Code) of String Literal in MacroExpansion (original) (raw)

chiasa.men via llvm-dev llvm-dev at lists.llvm.org
Thu Aug 26 01:02:57 PDT 2021

https://gist.github.com/T35R6braPwgDJKq/6439fda090e4ee8440d726f8dafa4dbb#file-mectest-cpp

Above I modified the MacroExpansionContext unittest. The relevant code: //-------------- TEST_F(MacroExpansionContextTest, Custom) { // From the GCC website. const auto Ctx = getMacroExpansionContextFor(R"code( #define CONCATMACRO(parm) L##parm int f(wchar_t *b){} int main() { int a= f(CONCATMACRO("TEST")); int b= f(L"TEST"); return 0; } )code"); Ctx->dumpExpansionRanges(); //> :6:14, :6:33 Ctx->dumpExpandedTexts(); //> :6:14 -> 'L"TEST"' printf("Exp: %s\n",Ctx->getExpandedText(at(6, 14)).getValue()); //Exp: L"TEST" printf("Org: %s\n",Ctx->getOriginalText(at(6, 14)).getValue()); //Org: CONCATMACRO("TEST")); // int b= f(L"TEST"); // return 0; //} StringRef sourceText = clang::Lexer::getSourceText(CharSourceRange(SourceRange(at(6, 14),at(6, 33)),false),SourceMgr, LangOpts); printf("sourceText: %s\n",sourceText); // sourceText: CONCATMACRO("TEST")); // int b= f(L"TEST"); // return 0; // } } //-------------- I am interested in getting the range for "TEST" in the SourceText. Since the CONCATMACRO is preprocessed to L"TEST" I thought the MacroExpansionContext would be of help. It tells about the ExpansionRanges: 6:14, :6:33 which is CONCATMACRO("TEST") What I would need is: 6:26, 6:32 Obviously I could just calculate a bit like: range.begin (14) + macronameLen (11) +1 (opening parenthesis) = 26 to range.end (33) - 1 (closing parenthesis) = 32

But would that be reliable and is there no other way?

Furthermore: Why do getSourceText/getOriginalText print the whole rest of the source code and not just from (6,14) to (6,33)? -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20210826/aba19521/attachment.html>

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